I believe I was 9 or 10 at the time. My mother played in a small rock
band with some friends, and my father helped out with sound
occasionally. They were due to play at a small club somewhere in the
city, and had informed me that they wouldn't be home until late. They
left me the phone number to the club and told me to call in the case of
an emergency, and they would leave the neighbors phone number just in
case.\
About and hour after they left, I had started watching some TV and
making myself some food when I heard a knocking sound on the West side
of the house. At the time, my garage occupied this space so I assumed
something had fallen over in the garage and hit the wall. My dog also
had an opening near the back door of the garage to get in and out when
it rained, so perhaps he was coming in that way and hit something.
Either way, I decided not to worry about it.\
A short time later I heard another noise, but it wasn't the same
knocking noise I had heard before. It sounded like someone was scraping
a metal object on the metal fence that surrounded our property. The
noise continued for several minutes, going back and forth along the
fence. I looked out the upstairs window, but I couldn't see anything. My
dog was surprisingly quite at this point, I figured if someone was out
there he would have started making some kind of noise.\
Eventually the sound stopped. I had made my way back down to the
basement to grab the phone from our living room. Once I grabbed the
phone, I heard a very violent pounding sound on our fence. It sounded
like someone was trying to smash the fence down. It was at this time
that I heard my dog going crazy. My dog was an Alaskan Malamute,
possibly 150 lbs and was as tall as I was. I stayed in the darkness of
the living room with the phone ready to dial. I made my way through the
darkness of the downstairs hallway into a small guest bedroom we had.
There was a walkout door that opened into the backyard on the opposite
side from where all the noise was coming from. My dog was still
growling, and barking like I had never heard. It sounded more severe
than when he would bark at the mailman, or school bus. I slowly made my
way over to where the dog was, while dialing the number to the club. The
phone seemed to ring forever...nobody was picking up. I dialed my
neighbor, nobody picked up there either. I remained in the backyard, in
the shadows for hours.\
The slamming noise had stopped, but my dog still wouldn't stop barking.
I had imagined walking around the house to see someone standing just
outside the fence staring at me. I was terrified. Finally, I saw a pair
of headlights pull up into our driveway. It was at that point that I
made my way over to the area I had heard the noises. The fence was
missing a metal pole used to anchor it into the ground, and there was a
bit of damage done to the surrounding fence. My dog was fine,
thankfully.\
To this day, even though that dog has since passed I still thank him for
potentially saving my life. My family doesnt really know how to take the
story. When I bring up the fact that the fence doesnt just damage itself
my parents agree, but dont think I was in any real danger. Nothing like
that happened again.

TL;DR: I was home alone, heard some pounding and scraping noises on the
fence outside. It sounded very aggressive, very quick. Eventually the
sound stopped, and after my parents got home I inspected the fence to
see there was some damage, and a metal support pole missing.